Count down the days to Christmas with this Solar System advent calendar. Every day in December, open a window to a spectacular space image. All the images are from NASA and depict the planets, asteroids and comets that make up the solar system.

This app has a window for each day in December, and on the day you can open and view the picture behind the window.

Can't wait to open all the windows? This version adds the option (via In App Payment) to open the windows whenever you want!

There are 24 different photographs, each featuring an informative caption including: